What does it mean when a guy....

This question would be to all the men out here. What does a guy mean when he asks a woman if she likes giving head??? I was asked this right after going down on him and of course I replied Yes I do, but the fact that he had to ask is making me think he might have not liked something or I sucked at it for him. I asked him why he asked and he replied, "because You're so good at it." I just still feel unsure about why he asked. So guys what is your opinion on this scenerio.